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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>paho_mqtt3as_sys</a>::<wbr><a class="fn" href=''>MQTTAsync_connect</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust fn'>pub unsafe extern &quot;C&quot; fn MQTTAsync_connect(<br>&nbsp;&nbsp;&nbsp;&nbsp;handle: <a class="type" href="../paho_mqtt3as_sys/type.MQTTAsync.html" title="type paho_mqtt3as_sys::MQTTAsync">MQTTAsync</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;options: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const </a><a class="struct" href="../paho_mqtt3as_sys/struct.MQTTAsync_connectOptions.html" title="struct paho_mqtt3as_sys::MQTTAsync_connectOptions">MQTTAsync_connectOptions</a><br>) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/std/os/raw/type.c_int.html" title="type std::os::raw::c_int">c_int</a></pre><div class='docblock'><p>This function attempts to connect a previously-created client (see
MQTTAsync_create()) to an MQTT server using the specified options. If you
want to enable asynchronous message and status notifications, you must call
MQTTAsync_setCallbacks() prior to MQTTAsync_connect().
@param handle A valid client handle from a successful call to
MQTTAsync_create().
@param options A pointer to a valid MQTTAsync_connectOptions
structure.
@return ::MQTTASYNC_SUCCESS if the client connect request was accepted.
If the client was unable to connect to the server, an error code is
returned via the onFailure callback, if set.
Error codes greater than 0 are returned by the MQTT protocol:<br><br>
<b>1</b>: Connection refused: Unacceptable protocol version<br>
<b>2</b>: Connection refused: Identifier rejected<br>
<b>3</b>: Connection refused: Server unavailable<br>
<b>4</b>: Connection refused: Bad user name or password<br>
<b>5</b>: Connection refused: Not authorized<br>
<b>6-255</b>: Reserved for future use<br></p>
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